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Abstract

Comparisons were made of various growth factors for Ostrinia nubilalis (Hünner) when reared on pinto bean, wheat germ, and lima bean diets. Larval weights at 12–13 days were 1.7- and 2.3-fold greater on pinto bean diet than on wheat germ and lima bean diets, respectively. Larvae reared on pinto bean diet had earlier pupation and heavier pupae than those reared on the other two diets. Pupal weights for all diets were significantly higher in a laboratory colony maintained for 8.7 years versus one maintained for 0.7 year, indicating that a genetic shift in the ability to develop under laboratory conditions has taken place in the older population. Fumidil B in pinto bean diet at ≥1,000 ppm increased time of development to some degree; however, pupal weights were unaffected by amounts as high as 1,500 ppm. The method for preparing lima bean diet is described.

Ostrinia nubialis, pinto bean diet, wheat germ diet, lima bean diet, growth, Fumidil B
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© 1986 Entomological Society of America
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